@inproceedings{ijcai2007p226,
  title     = {Infeasibility Certificates and the Complexity of the Core in Coalitional Games},
  author    = {Malizia, Enrico and Palopoli, Luigi and Scarcello, Francesco},
  booktitle = {Proceedings of the Twentieth International Joint Conference on
               Artificial Intelligence, {IJCAI-07}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Ramon López de Mántaras},
  pages     = {1402--1406},
  year      = {2007},
  url       = {https://ijcai.org/proceedings/2007/226},
}